(n.) A human chameleon; someone who has no personality of their own. Word originates in the mockumentary 'Zelig'.
That guy can never make up his mind; he always agrees with whoever he is talking to. He is such a Zelig.
Adj. The way your dude feels after you have killed it repeatedly while working consecutive weeks in Wendell, NC. In order to releive the zelig sensation, you should poor muscle milk on your dude and point your little personal fan at your dude to cool it off by blowing cool air on it.
My dude is SO zelig right now.